Definition
Availability Heuristic
The availability heuristic is the mental shortcut of judging how likely something is by how easily examples come to mind, rather than by actual probability.
A recent market crash, a friend's lottery-like multibagger, or saturated news of a fraud makes those events feel more probable than they are. Investors overreact to vivid, recent, emotionally charged stories — avoiding equities after a salient crash, or chasing a sector because success stories are everywhere in the media.
This bias distorts risk perception: dramatic but rare events feel common, while slow, boring risks (inflation eroding fixed deposits, under-saving for retirement) feel remote. Relying on base rates and long-run data rather than memorable anecdotes is the corrective.
Related terms
- Herd MentalityHerd mentality is the tendency to copy the financial decisions of a crowd — buying what everyone is buying and selling when everyone panics — instead of relying on independent analysis.
- Recency BiasRecency bias is the tendency to give too much weight to recent events and to assume the latest trend will continue, while ignoring longer history.
Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.